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Investment gains (losses) (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Summary of investment gains (losses) | Investment gains (losses) are summarized as follows (in millions).
| Third Quarter |  |  | First Nine Months |
| 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Investment gains (losses): |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |
Increase in unrealized investment gains during the period on securities held at the end of the period | $ | 20,555 |  |  | $ | 18,643 |  |  | $ | 23,559 |  |  | $ | 45,053 |
Investment gains (losses) on securities sold during the period |  | 1,365 |  |  |  | 1,868 |  |  |  | (820 | ) |  |  | 1,221 |
|  | 21,920 |  |  |  | 20,511 |  |  |  | 22,739 |  |  |  | 46,274 |
Fixed maturity securities: |  |  |  |  |  |  |  |  |  |  |
Gross realized gains |  | 27 |  |  |  | 23 |  |  |  | 43 |  |  |  | 37 |
Gross realized losses |  | (13 | ) |  |  | (17 | ) |  |  | (68 | ) |  |  | (57 | )
Other |  | 5 |  |  |  | (3 | ) |  |  | (846 | ) |  |  | (7 | )
| $ | 21,939 |  |  | $ | 20,514 |  |  | $ | 21,868 |  |  | $ | 46,247 |

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- Definition Tabular disclosure of realized and unrealized gain (loss) on investment in security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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- References No definition available. + Details
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